7. Y. Hu and X. Sun,"Chemically Functionalized Graphenes and their Applications in Electrochemical Energy Conversion and Storage" in the book of "Advances in Graphene Science", ISBN 980-953-307-981-8. InTech - open science, open minds. Website: http://www.intechopen.com/ (2013). (This chapter has so far been accessed 1000 times in last a few months, updated in Jan. 2014)